What is dark matter?

So-called "dark matter" is one of astronomy's greatest mysteries. This invisible force shapes galaxies, determines the structure of the universe - and divides scientists. But what led researchers to dark matter? What methods are currently used to search for it? What alternatives are there and what would that mean for our understanding of the universe? Renowned science journalist Thomas Bührke describes the current theories, experiments, and results, features leading scientists, and presents the current state of research.


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